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Fracture characteristics of Al-4 pct Mg mechanically alloyed with SiC

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Abstract

Subcritical crack growth and rapid fracture of the mechanically alloyed aluminum alloy IN-9052* reinforced with SiC particles have been investigated. Fatigue crack growth rates for the composite exceed those of the unreinforced alloy, except that the threshold stress intensity for growth is higher for the composite. Fracture toughness of the composite is about 9 MPa√m compared to a (reported) value of 29 MPa√m for the unreinforced alloy. The contributions to fracture toughness from work done within the plastic zone and in formation of the void sheet have been computed using analytical models. Fracture toughness is shown to result almost entirely from work done within the plastic zone of the growing crack. The matrix microstructure and the particulate characteristics are found to account for the elastic and fracture properties of this composite.

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  1. Department of MaterialsSciences, Southwest Research Institute, 6220 Culebra Road, 78284, San Antonio, TX

    D. L. Davidson (Institute Scientist)

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  1. D. L. Davidson
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Davidson, D.L. Fracture characteristics of Al-4 pct Mg mechanically alloyed with SiC. Metall Trans A 18, 2115–2128 (1987). https://doi.org/10.1007/BF02647083

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